The Effects of Sodium Chloride & Methylene blue on Bacterial flora of rearing water and Skin & Gill of Iranian sturgeon fingerlings (Acipenser persicus)

It`s so difficult to control the fish diseases, because they`re being bred in systems which depend on environmental conditions . A disease can occur when the disease making factors pass the primary barriers. There are 3 main ways for the transmission of putrefaction through skin. gill and digestive vessels. In this survey, we studied the effects of Sodium Chloride and Methylene blue on bacterial flora of the skin, gill and rearing water of 360 Iranian sturgeon fingerlings ( A c i p e n s e r p e r s i c u s )with the average weight of 1.74 ±0.45 in Dr.dadman International Sturgeon Research.The experiment was done with 6 treatment and 3 repetition for each substance. During the experiment the temperature of water was 23.78±0.2 c, soluble oxygen 7.08 ± 0.27 mg/lit and the pH of water was 7.6±0.32. The obtained results from water bacteria counting show that after 96 hours sodium chloride doesn`t have any influence on bacterial flora of water and after 96 hours in treatment 6.3 g/l in skin tissue was less than control and other treatments. The obtained results from water bacteria counting exposed to Methylene blue in treatment 3.83mg/l is less than control and other treatments and also in treatment 1.56 mg/l Methylene blue in skin and in treatment 1 mg/l is less than other treatments.